Pneumatic control



@ :'&. 23, 1923.

H.M.SALYER PNEUMATIC CONTROL Original Filed Dec. 24.

iii

Patented Oct. 23, 1923:.

QE HQEG HARRY llI. SALYER, OF BLODMFIELD, NEW JERSEY.

PNEUMATIC CONTROL.

Application filed December 24, 1920, Serial To all whom. it mayconcern."

Be it known that I, HARRY M. SALYER,'& citizen of. the United States,and a resident of Bloomfield, in the county of Essex and State of NewJersey, have invented certain new and useful Improvements in PneumaticControls,of which the following is a full, clear, and exact description,whereby anyone skilled in the artmay make and use the same.

The invention relates to an apparatus which will become active undervarying tluid pressures for the purpose of translating energy thusdeveloped thru suit-able mechanical connections for operating anydesired mechanism.

The object of the invention is to provide an apparatus which will becapable of automatic control and thereby translate movements induced byvarying l'luid pressures to any given apparatus.

More particularly, the object is to provide an extremely responsive,positive and quick acting pneumatic device, the control of which dependsupon the rapid unbalancing of the pressures in opposite sides of thediaphragm.

The apparatus is illustrated herein, in conjunction with a music sheetperforating machine wherein its application is well illust1 ated. Insuch machines it is necessary to have an extremely rapid and responsivecoordination between the tracker board of the master roll and thepunching mechanism for perforating the music sheets.

By illustrating the mechanism in conjunction with such an apparatus itsextreme simplicity, certainty, and rapidity of action would be obvious.It i to be understood, however, that the apparatus and the invention isnot limited in its lield of application to music perforating machines.

One of the special features of the apparatus, as will be hereinafterexplained, is the individual unit construct-ion of pneumatics allactuated from a main suction chest and controlled by venting withoutnecessitat ing a closure of the connections from the diaphragm chamberto the main suction chest. This is all accomplished by differentialsizes in two diaphragms coth forming walls of the suction chest and withconstant suction imposed upon both diaphragms from the suction chestside.

The main or actuating diaphragm is always in equilibrium with a constantsuction lZ T0. 432,954. Renewed September 22, 1923.

011 opposite sides thereof, except when one side is open to atmosphericpressure. It will then be displaced through connections intermediate itand the opposed diaphragm by atmospheric pressure, it being larger inarea than the opposing diaphragm which is always under atmosphericpressure on one side and normally under the same suction pressure.

Referring to the drawings Fig. 1, is a diagrammaticview illustrating theelemental connections between the tracker board and punchers of a sheetperl'OIltlIig machine.

Fig. 2, is a :t'ragmentary detail showing in elevation a series ofpneumatic controllers looking from the right of Fig. 1.

F 3, is a sectional view through one of the controllers of Fig. 2illustrating the conncctions therefrom to the punch slides, and theprovision or the controller parts with a tracker connection closed.

Fig. 4-, is an enlarged sectional view of the pneumatic controllershowing the parts in position with the tracker connection open.

1 am aware that it is known in the art to provide two diaphragms ofdifferent areas, each having one side open to atmospheric pressure andwith the opposite sides connected with a closed suction chest withproision for venting one of the diaphragms to cause an overbalancin or"the system.

The invention herein defined involves the use of two diaphragms inparallel planes, both diaphragms freely connected with the main suctionon the adjacent faces and one of said diaphragms normally connected atits opposite side with the main suction chest and periodically connectedwith the atmosphere. To effect the proper results there is acomparatively small connection or bleed from the main suction chest tothe outside of the larger diaphragm and a comparatively largeatmospheric vent for said chamber controlled from a tracker board or thelike. i

In the accompanying drawings a form of the invent-ion is illustrated inconjunction with perforating punchers the numeral 1. denotes a suctionchest suitably connected through a conduit 2, with a suction apparatusnot specifically illustrated in the drawings. This suction chest has aseries of openings 3, preferably of circular form into which fitcylindrical covers 4, fori'ning diaphragm chambers 5.,

These covers are held in placeby. any suitable means as for instance, byscrews 6, and the joint is sealed by diaphragm 7, which extends about anannular shoulder 8, against which the cap or casing i, is pressed.

Opposed to the opening 3, of the suction chamber 1 there is a smallerdiaphragm member 8, suitably held in place ras by a ring 9, forcing thediaphragm into an annular groove 10. The center of the diaphragm has acontact piece 11, clamped to it by a bifurcated stud 12, to which ispivoted as at 18, a lever 1-1. The lever in turn is pivoted as at 15, toa bracket 16.

The outer end of the lever 14:, is pivoted as at '17, to a punch sliderod 18, which through a pivot and socket 19, 20, is connected with thepunch slide 21. These punch slides (there being one for each pneumaticactuator) aresuitably supported and guided to be moved longitudinallyinto an outer contacting position over the punchers 22, so that a punchhead 23, reciprocated by an eccentric connecting rod 2a, will drive thepunchers 22,through the sheets 2%, overlying the guide 25. I

The contact piece 11, bears upon the diaphragm 7, and the diaphragmchamber 5, is connected through a comparatively large duct 5 witha'traclrer board T. The diaphragm chamber ,5, is also connected througha comparatively small duct 5, with the main suction chamber 1".

This connection 5 provides for a constant suction on both sides of thediaphragm 7,"so thatcthe diaphragm is normally in equilibrium andalthough of a larger area than the opposing diaphragm 8, will bedisplaced by the atmospheric pressure upon the diaphragm 8, asillustrated in Fig. This is dueto the bleed connection 5 which cqualizesthe pressure on opposite sides of the diaphragm 7, so that both sides ofthe diaphragm are subject to the same pressure as that represented bythe suction in the main suction chest 1*.

As soon as the comparatively large duct 5*, is opened to atmosphere thediaphrag 7, 0t comparatively larger area than the diaphragm 8, itinstantly moves inward under the suction of the chest 1 moving thecontactpiece 11, and forces the lever together with the diaphragm 8,into the position illustrated in Fig. 4-..

It will be obvious that there bean in stantaneous reaction of thediaphragm 7, whenever the duct 5 .is open to atmos phere and willlikewise be sul'istantially an instantaneous reaction of the diaphragm7, the instant the duct 5", is close I have found in practice that thispneumatic syst m is much more reliable and quicker in its reactions thanan electromagnet which I have employed hereinbeopposite sides.

1 ,avaoa'r fore in music perforating apparatus. It is far less liable toderangement than an electrical apparatus and will give comparativelylonger. movements with greater certainty of action and increased powerfor any given leverage. v

I. will be apparent that there is no valve connection necessary forcontrolling the pneumatic other than the opening and closing of theatmospheric ducts 5 and therefore no loss of air such as occurs in theordinary pneumatic devices due to changing from suction to atmosphere.

The valve chest and the pneumatic chambers are in closed circuit alwaysunder constant sub-atmospheric pressure except as the diaphragm chambers5, are vented through the ducts 5 Obviously the volume of exhaust andintensity of the suction of the single suction chest may be such thatthe slight induction or atmospheric air through the comparatively smallbleed ducts 5 will have no appreciable effect upon the operation of thediaphragmswhere one or many of them are in operation at the same time.

Attention is particularly called to the bleed connection and atmosphericconnection 5 5 affect only the diaphragm 7, and in no way interfereswith the full value of atmospheric pressure upon the diaphragm 8. Thesaid diaphragm being always under atmospheric pressure at one side andalways under full suction at the opposite side.

This system, as above defined, must not be confused with those systemsusing diti erential sized diaphragms both o t which are constantly opento atmospheric. pressure at one side and rely upon an overbalancingthrough the diii erence in degree of suction upon the diaphragms fromthe that the pneumatic controls, hereinbeforc described, are applicableto many types of apparatus such, for instance, as weaving andembroidering machines and in fact, any machines wherein a selectiveoperation of various units is desired and may be controlled trom acomparatively remote .manual tracker board or smaller cont-rollingapparatus.

For instance, I have employed this same type of pneumatic control inconjunction with. a manual for automatically changing master sheets tobe used as masters in the procuction oi perforated music roll sheets. IV] hat I claim as my invention and desire to secure by Letters Patentis:

1. ii. pneumatic control comprising a suction chest, two oppositelydisposed diaphragms, one of said diaphragms of greater areathan theother, a casing forming a diaphragm chamber enclosing the largerdianovel condition under which the suction It will be at once apparent"j phragm, a duct communicating with the diaphragm chamber and thesuction chamber and an atmospheric duct for modifying the action of thesuction duct.

2. A pneumatic control comprising a suction chest, axially alignedperforations extending to opposite walls of the suction chest and ofdifferent areas, a diaphragm closing each of said perforations, adiaphragm chamber exterior to the suction chest and closing the largerof said diaphragms, a comparatively small bleed connection from thediaphragm chest to the suction chest and a comparatively largeatmospheric duct connected with the diaphragm chamber, means forcontrolling the atmospheric duct and a lever for translatingthemovements of the diaphragm.

3. A pneumatic control for music punching machines comprising a suctionchamber, oppositely disposed diaphragms of different areas, the largerof said diaphragms being enclosed by a diaphragm chamber, acomparatively small bleed connection from the diaphragm chamber to thesuction chamber, an atmospheric connection for the diaphragm chamber, atracker controlling said connection, a lever reciprocated by themovements of the two diaphragms, a punch slide connected with saidlever, a reciproeating punch head and punchers moved by the punch slideand reciprocating head.

4. A pneumatic control for music punching machines comprising a suctionchest, a plurality of diaphragm chambers, diaphragms in each of saidchambers, a diaphragm oppositely disposed to the diaphragm chamber andsubject to the suction of the suction chest of one side and open toatmospheric pressure of the opposite side, a lever connection at theouter side of said diaphragm and contact piece extending from the innerside of the diaphragm to the opposed diaphragm which is of larger area,comparatively small bleed ducts communicating between each of thediaphragm chambers and suction chamber and comparatively largeatmospheric ducts communicating between each of the diaphragm chambersand a tracker board.

5. A pneumatic control comprising a suc tion chest, two oppositelydisposed diaphraglns, one of said diaphragms having a greater area thanthe other, the larger of said diaphragms arranged in a chamber, a ductcommunicating with said chamber and the suction chamber and anatmospheric duct for modifying the action of the suction duct.

6. A pneumatic control comprising a suction chest, two oppositelydisposed diaphragms, one having a greater area than the other, a suctionduct for causing movement of both diaphragms in one direction and anatmospheric duct for breaking the suction at one side of the largerdiaphragm, Whereby both diaphragms are moved in the opposite direction.

7. A pneumatic control comprising a suction chest, two oppositelydisposed diaphragms, one having a greater area than the other, thesmaller diaphragm being constantly subject to atmospheric pressure andthe larger diaphragm being normally subject on both sides, tosub-atmospheric pressure and an atmospheric duct for breaking thesub-atmospheric pressure on one side of the diaphragm.

HARRY M. SALYER. Witnesses HARRY F. MELA, M. JOSEPHINE CnoWELL.

